Which of the following provides the best example of selective breeding? a
Scientists have noted that different varieties of birds on different islands have beaks that are suited to the birds available foods
b
Racehorses that run fastest are the ones that are allowed to produce offspring, leading to faster racehorses
c
Leopard seals captured in Antarctica have thicker layers of blubber than harbor seals captured in the Pacific Ocean
d
Hummingbirds have a long, narrow beak that enables them to reach food in the deepest part of the flower

Once a woman attains puberty, her overuse mature and release one egg per ovarian cycle. which hormone stimulates this event?

How are the testes and ovaries similar? a. both produce sex cells. b. both connect internal reproductive organs to the exterior. c. both transport sex cells from their site of production. d. both store mature sex cells.

African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.